condition mean min max ZT0-3 14.747686666666667 8.37221 18.389499999999998 ZT4-7 11.3514 11.3514 11.3514 ZT8-11 11.50985 11.50985 11.50985 ZT12-15 14.520675 13.4101 15.631250000000001 ZT16-19 16.3977 16.3977 16.3977 ZT20-23 21.8542 21.8542 21.8542